http://www.ck12.org Chapter 5. Measures of Central Tendency
The following table of grouped data represents the weights (in pounds) of all 100 babies born at a local hospital last
year.
TABLE5.16:
Weight (pounds) Number of Babies
[ 3 − 5 ) 8
[ 5 − 7 ) 25
[ 7 − 9 ) 45
[ 9 − 11 ) 18
[ 11 − 13 ) 4- What is the summation of the values ofmffor each class?
- What is the value ofN?
- Calculate the mean weight for a baby.
The following table of grouped data represents the ages (in years) of 50 of the 500 teachers in a school district.
TABLE5.17:
Age (years) Number of Teachers
[ 25 − 35 ) 7
[ 35 − 45 ) 8
[ 45 − 55 ) 16
[ 55 − 65 ) 10
[ 65 − 75 ) 9- What is the summation of the values ofmffor each class?
- What is the value ofn?
- Calculate the mean age for a teacher.
The following table of grouped data represents the numbers of miles on all 25 cars in a used car lot.